I had a few also and lost them all with in 2 weeks of each other. My neighbor had also gotten some and we feed the same food and pretty much the same method of raising and tending to them. The only difference we could figure out, was that I gave mine water out of the sink (city water) and he caught rain water, or let the water sit for 24 hrs. I don't know if this was my problem but I am gonna try agein in the spring and not make the same mistake.
